public class E2_3_4 {
  public static void main(String args[]) {
    long[] a = {1, 2, 3, 4};
    long[] b = {100, 200, 300, 400, 500};
    b =a;
    System.out.println("数组b的长度："+b.length);   //[代码1]
    System.out.println("b[0]="+b[0]); //[代码2]
  }
}
